- Machine Shop & Tool Repair Service, Trenton
- Machinery Movers & Erectors, Trenton
- Machinery, Supplies & Equipment - Business Production Related, Trenton
- Machinery, Supplies & Equipment - Business Supplies Related, Trenton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Trenton
- Magazine & Newspaper Stands, Trenton - Dealers & Distributors
- Mailing, Delivery & Courier Service, Trenton
- Major Appliances, Trenton - Household & Kitchen
- Management Consultants & Services, Trenton
- Manicurists & Pedicurists, Trenton
- Manufacturing, Trenton
- Manufacturing Products, Trenton
- Marinas & Marina Services, Trenton
- Marine Supplies & Equipment, Trenton - Boat Supplies
- Marriage & Family Counselors, Trenton
- Masonry Contractors, Trenton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Trenton
- Massage Therapists & Professional, Trenton
- Massage Therapy, Trenton
- Mastectomy Apparel, Forms, Prostheses & Supplies, Trenton
- Medical Supplies & Equipment, Trenton
- Medical Transcription Service, Trenton
- Membership Sports & Recreation Clubs, Trenton
- Men's Clothing Stores, Trenton - Clothes & Accessories
- Mens & Womens Clothing, Trenton
- Mental Health Specialists, Trenton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Services, Trenton
- Methodist Church, Trenton
- Millwrights, Trenton
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- Mineral Wool Manufacturers, Trenton
- Mini & Self Storage, Trenton
- Miscellaneous Agriculture, Trenton
- Miscellaneous Business Services, Trenton
- Miscellaneous Government, Trenton
- Miscellaneous Industry, Trenton
- Miscellaneous Manufacturing, Trenton
- Miscellaneous Personal Services, Trenton
- Miscellaneous Photographers, Trenton
- Miscellaneous Professional, Trenton
- Mobile Home Parks & Communities , Trenton
- Money Transfer Service, Trenton
- Monuments, Tombstones, Markers & Memorials, Trenton
- Mortgage Bankers & Correspondents, Trenton
- Motion Picture & Television Production Services, Trenton
- Motion Picture Dists & Producers, Trenton
- Motion Pictures Video Tape Duplication & Transfer Services, Trenton
- Motor Vehicle, Trenton
- Motor Vehicle Rental & Leasing, Trenton
- Motorcycle Parts, Accessories & Dealers, Trenton
- Movie Theaters, Trenton
- Moving Companies, Trenton
- Moving Truck Rental , Trenton
- Museums, Trenton
- Music, Trenton
- Music Lessons, Trenton
- Music Lessons - Instrumental, Trenton
- Musical Instruments & Equipment Stores, Trenton
- Musical Instruments Repair, Sales & Service, Trenton
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